<template>
  <view>
    <view class="search-box">
      <!-- 使用uniapp组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" ></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="forward" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17"  @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodaList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        //搜索关键词
        kw :'',
        //搜索的结果列表
        searchResults:[],
        historyList:[],
      };
    },
    onLoad() {
     this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      //input输入事件的处理函数
      input(e){
        //输入的时候进行防抖处理，使用延时器
        clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        this.kw = e.valueOf()
        this.getSearchList()
          // console.log(e.valueOf())
        },500)
      },
    async  getSearchList(){
        //判断搜索关键词是否为空
        if(this.kw.length === 0){
          this.searchResults = []
          return
        }
        const  {data : res}  = await  uni.$http.get('/api/public/v1/goods/qsearch',{query : this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.savaSearchHistory()
      },
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'../goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      //保存搜索历史记录
      savaSearchHistory(){
        // this.historyList.push(this.kw)
        this.historyList.unshift(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        // this.historyList.unshift(Array.from(set))
        this.historyList = Array.from(set)
        // console.log(set)
        //对搜索历史数据进行持久化的存储
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      gotoGoodaList(item){
        uni.navigateTo({
          url:'../goods_list/goods_list?query=' + item
        })
      }
    },
    computed:{
      histories() {
      return  [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      //文字不允许换行
      white-space: nowrap;
      //溢出部分隐藏
      overflow: hidden;
      //用三个小圆点...替代溢出部分
      text-overflow: ellipsis;
      margin-left: 3px;
    }
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom:  1px solid #efefef;
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
}
</style>
